基于LCA的PET再生纺织品环境影响分析

Environmental impact assessment of recycled PET textile using LCA methodology

为分析PET(聚对苯二甲酸乙二醇酯)再生纺织品的环境效益及其生产过程中的重点改进因素,基于生命周期评价(LCA)研究思路,采用经济价值分配结合cut-off规则的方法对废弃PET材料作为原生材料时产生的环境负荷进行分配,核算出再生技术与原生技术(所生产的产品具有相同消费功能)两个模拟情景的环境负荷,并对再生工艺流程的LCA模型进行归一化分析与敏感性分析.结果表明:相对于原生技术,再生技术每生产1t PET再生纺织品可减少1640kg的温室气体排放,并节约40400MJ的不可再生能源使用,人体毒性潜值、富营养化潜值、淡水生态毒性潜值等环境影响指标均有不同程度的下降.6个生产工艺环节中反应增容对总体环境负荷的贡献最大,电力与甲基丙烯酸缩水甘油酯的消耗量应作为重点改进因素.

Based on the rational of life cycle assessment(LCA),this paper proposes to allocate the environmental impact exerted by PET recycled products otherwise wasted and calculate the environmental loads brought by the manufacturing process using recycling technology and original technology,through using the approach of economic value allocation and the cut-off principle.Moreover,this study conducts normalization and sensitivity analysis of LCA modeling for the manufacturing process.The results show that comparing with the original technology,the PET recycling technology can bring about a reduction of 1640kg of greenhouse gas emissions and 40400MJ of non-renewable energy.Besides,environmental indicators such as Human Toxicity Potential,Eutrophication Potential and Marine Aquatic Ecotoxicity Potential was decreased respectively.Among the six fabrication processes,in-situ reactive compatibilization had the greatest contribution to the total environmental loads,and the consumption of electricity and glycidyl methacrylate should be the key factors to improve.